.top{
    width: 100%;
    height: 550px;
    // background-color: yellow;
    overflow: hidden;
}
.bottom {
    width: 100%;
    overflow: hidden;
}

.center{
    width: 100%;
    margin:20px 0;
}
.left{
    float: left;
    width: 70%;
    height: 100%;
    background-color: white;
    border-right: 1px solid #ddd;
}
.right{
    float: left;
    width: 30%;
    height: 100%;
    background-color:white;
}